BOILERS INTRODUCTION TO BOILERS A boiler is an enclosed vessel that provides a means for combustion and transfers heat to water until it becomes hot water or steam. The hot water or steam under pressure is then usable for transferring the heat to a process. Water is a useful and cheap medium for transferring heat to a process. When water is boiled into steam its volume increases about 1,600 times, producing a force that is almost as explosive as gunpowder. Liquid when heated up to the gaseous state this process is called evaporation. The heating surface is any part of the boiler; hot gases of combustion are on one side and water on the other. The source of heat for a boiler is combustion of any of several fuels, such as wood, coal, oil, or natural gas. HISTORY Boilers were built as early as the 1st century AD by Hero of Alexandria but were used only as toys, till 17th century. The first boiler with a safety valve was designed by Denis Papi...